<s>
Gollum	B-Application
is	O
a	O
wiki	B-Protocol
software	I-Protocol
using	O
git	B-Application
as	O
the	O
back	O
end	O
storage	O
mechanism	O
,	O
and	O
written	O
mostly	O
in	O
Ruby	B-Language
.	O
</s>
<s>
It	O
started	O
life	O
as	O
the	O
wiki	B-Protocol
system	O
used	O
by	O
the	O
GitHub	B-Application
web	O
hosting	O
system	O
.	O
</s>
<s>
Although	O
the	O
open	O
source	O
Gollum	B-Application
project	O
and	O
the	O
software	O
currently	O
used	O
to	O
run	O
GitHub	B-Application
wikis	B-Protocol
have	O
diverged	O
from	O
one	O
another	O
,	O
Gollum	B-Application
strives	O
to	O
maintain	O
compatibility	O
with	O
the	O
latter	O
.	O
</s>
<s>
Gollum	B-Application
wikis	I-Application
are	O
simply	O
Git	B-Application
repositories	O
that	O
adhere	O
to	O
a	O
specific	O
format	O
.	O
</s>
<s>
Gollum	B-Application
pages	O
may	O
be	O
written	O
in	O
a	O
variety	O
of	O
formats	O
including	O
Markdown	O
,	O
AsciiDoc	B-Language
,	O
ReStructuredText	B-Language
,	O
Creole	O
and	O
MediaWiki	B-Application
markup	O
.	O
</s>
<s>
Editing	O
the	O
pages	O
can	O
be	O
done	O
via	O
the	O
provided	O
web	O
interface	O
,	O
via	O
its	O
API	B-General_Concept
or	O
with	O
a	O
text	O
editor	O
directly	O
in	O
the	O
git	B-Application
repository	O
.	O
</s>
